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Tetramethyl orthosilicate

Product Name
Tetramethyl orthosilicate
CAS No.
681-84-5
Chemical Name
Tetramethyl orthosilicate
Synonyms
TMOS;TETRAMETHOXYSILANE;Dynasil M;METHYLSILICATE;Tetramethylsilicate;tl190;DK866;TL 190;CFS-845;(CH3)4SiO4
CBNumber
CB6177258
Molecular Formula
C4H12O4Si
Formula Weight
152.22
MOL File
681-84-5.mol
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Tetramethyl orthosilicate Property

Melting point:
−4 °C(lit.)
Boiling point:
121-122 °C(lit.)
Density 
1.023 g/mL at 25 °C(lit.)
vapor density 
5.25 (vs air)
vapor pressure 
3.35 psi ( 20 °C)
refractive index 
n20/D 1.368(lit.)
FEMA 
3185 | METHYLATED SILICA
Flash point:
84 °F
storage temp. 
Store below +30°C.
form 
liquid
color 
colorless
Specific Gravity
1.032
explosive limit
0.88-23.8%(V)
Water Solubility 
hydrolysis
Sensitive 
Moisture Sensitive
Hydrolytic Sensitivity
7: reacts slowly with moisture/water
BRN 
1699658
InChIKey
LFQCEHFDDXELDD-UHFFFAOYSA-N
CAS DataBase Reference
681-84-5(CAS DataBase Reference)
NIST Chemistry Reference
Tetramethyl silicate(681-84-5)
EPA Substance Registry System
Tetramethyl silicate (681-84-5)
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Safety

Hazard Codes 
T+
Risk Statements 
10-26-37/38-41
Safety Statements 
16-26-36/37/39-45-28A
RIDADR 
UN 2606 6.1/PG 1
WGK Germany 
3
RTECS 
VV9800000
10-21
Autoignition Temperature
245 °C
TSCA 
Yes
HazardClass 
6.1
PackingGroup 
I
HS Code 
29209085
Hazardous Substances Data
681-84-5(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H226Flammable liquid and vapour

H315Causes skin irritation

H318Causes serious eye damage

H330Fatal if inhaled

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
8.14651
Product name
Tetramethyl orthosilicate
Purity
for synthesis
Packaging
25mL
Price
$53.7
Updated
2024/03/01
Sigma-Aldrich
Product number
8.14651
Product name
Tetramethyl orthosilicate
Purity
for synthesis
Packaging
100ML
Price
$59.3
Updated
2024/03/01
Sigma-Aldrich
Product number
218472
Product name
Tetramethyl orthosilicate
Purity
98%
Packaging
100g
Price
$105
Updated
2024/03/01
Sigma-Aldrich
Product number
218472
Product name
Tetramethyl orthosilicate
Purity
98%
Packaging
500g
Price
$182
Updated
2024/03/01
Alfa Aesar
Product number
L09716
Product name
Tetramethoxysilane
Purity
98%
Packaging
25g
Price
$26.65
Updated
2024/03/01
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Tetramethyl orthosilicate Chemical Properties,Usage,Production

Description

Tetramethyl orthosilicate is the chemical compound with the formula Si(OCH3)4. This molecule consists of four methoxy groups bonded to a silicon atom.
Two common organic precursors are tetraethyl orthosilicate (TEOS) and tetramethyl orthosilicate (TMOS). The latter is more toxic than the former.
Tetraethyl orthosilicate (TEOS), Si(OC2H5)4, is the first alkoxide of the series, followed by tetramethyl orthosilicate (TMOS), Si(OCH3)4, which is, however, less safe to handle and hydrolyzes faster than TEOS.
The hydrolysis of TMOS is, in fact, around six times faster: in general, a lower hydrolysis rate is associated with an increase of the organic group size in the silicon alkoxide. The properties of the silicon alkoxides change according to the dimension of the alkoxy; larger groups produce an increase in molecular weight, viscosity, and boiling point and a decrease in density of the alkoxides.
As a rule of thumb, a larger size of the alkoxy group is associated with a lower hydrolysis rate due to the steric hindrance. The reactivity follows the sequence, with tetramethyl orthosilicate the most reactive alkoxide:
tetramethyl orthosilicate >tetraethyl orthosilicate>tetra-n-propylorthosilicate>tetrabutyl orthosilicate

Chemical Properties

Tetramethyl orthosilicate (TMOS), the methyl ester of orthosilicic acid, is a colorless, low-viscosity liquid. It is industrially the most important of the tetraalkyl silicates.

Uses

Tetramethyl orthosilicate (TMOS) is popularly used in the sol-gel synthesis of silicates1 and chromium-doped silicates and in the formation of hexagonal mesoporous silica layers.

Uses

Coating screens of television picture tubes; mold binders; corrosion-resistant coatings; catalyst preparation; silicone intermediate

Uses

Tetramethyl Orthosilicate is a compound used in the research of the multifunctionality of silicified nanoshells and the efficiency at adsorbing cadmium ions at cell interfaces.

Production Methods

Silica aerogels are usually prepared by base-catalyzed reaction of tetramethoxysilane or tetraethoxysilane, mostly with ammonia as the catalyst. A modification of this procedure is to prehydrolyze Si(OR)4 with a small amount of water under acidic conditions.

General Description

A clear colorless liquid. Flash point below 125°F. Less dense than water and insoluble in water. Very toxic by ingestion and inhalation and very irritating to skin and eyes. Used to make paints and lacquers.

Air & Water Reactions

Flammable. Insoluble in water.

Reactivity Profile

Tetramethyl orthosilicate is incompatible with the following: Oxidizers; hexafluorides of rhenium, molybdenum & tungsten .

Hazard

Eye damage and upper respiratory tract irri-tant.

Health Hazard

TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Bromoacetates and chloroacetates are extremely irritating/lachrymators. Reaction with water or moist air will release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapors may travel to source of ignition and flash back. Substance will react with water (some violently) releasing flammable, toxic or corrosive gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water.

Flammability and Explosibility

Flammable

Safety Profile

Poison by intraperitoneal route. Moderately toxic by inhalation. Midly toxic by skin contact. A severe eye irritant. This material can cause extensive necrosis (experimentally), keratoconus, and opaque cornea. It also causes severe human eye injuries, as well as necrosis of corneal cells, which progresses long after exposure has ceased. It is destructive and its effects resist treatment. Permanent blindness is possible from exposure to it. The kidney seems to be most subject to injury regardless of the mode of exposure. Pulmonary edema has also occurred. This material is more toxic than either ethyl silicate or silicic acid, although it has been thought that the injury caused is largely due to the action of the silicic acid. Flammable when exposed to heat or flame; can react vigorously with oxidizing materials. Potentially violent reaction with metal hexafluorides (e.g., rhenium, molybdenum, tungsten). When heated to decomposition it emits acrid smoke and irritating fumes.

Potential Exposure

Methyl silicate is used in coating screens of television picture tubes. It may be used in mold binders and in corrosion-resistant coatings; as well as in catalyst preparation and as a silicone intermediate.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek med-ical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, includ-heart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medi-First Aid: If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek med-ical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, includ-ing resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medi-cal attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.Medical observation is recommended for 24- 48 h afterbreathing overexposure, as pulmonary edema may bedelayed. As first aid for pulmonary edema, a doctor orauthorized paramedic may consider administering a cortico-steroid spray.

storage

Color Code—Blue: Health Hazard/Poison: Storein a secure poison location. Prior to working with thischemical you should be trained on its proper handling andstorage. Store in tightly closed containers in a cool, wellventilated area away from water and moisture. Sources ofignition, such as smoking and open flames, are prohibitedwhere methyl silicate is used, handled, or stored in a manner that could create a potential fire or explosion hazard.

Shipping

UN2606 Methyl orthosilicate, Hazard class: 6.1; Labels: 6.1-Poisonous materials, 3-Flammable liquid.

Purification Methods

Purification is as for tetraethoxysilane. It has a vapour pressure of 2.5mm at 0o. [IR: Sternbach & MacDiarmid J Am Chem Soc 81 5109 1959. Beilstein 1 IV 1266.]

Incompatibilities

Vapor may form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, including alkaline earth metals, metals, strong acids, strong bases; water, moisture, steam decomposes releasing toxic, flammable gases. Violent reaction with metal hexafluorides of rhenium, molybdenum, and tungsten. Contact with metals may evolve flammable hydrogen gas.

Tetramethyl orthosilicate Preparation Products And Raw materials

Raw materials

Preparation Products

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Tetramethyl orthosilicate Suppliers

Zhangjiagang Xinya Chemical Co., Ltd.
Tel
0512-58980899 13915696858
Email
sales@zjgxinyachem.com
Country
China
ProdList
27
Advantage
58
HUANGSHANJIAHUASILICONE CO,LTD
Tel
15212785412
Email
hsuzihang@163.com
Country
China
ProdList
71
Advantage
58
Wuhan Andaomai New Energy Co., Ltd
Tel
13554075426
Email
1014723310@qq.com
Country
China
ProdList
2060
Advantage
58
Jingzhou Yinjie Chemical Co., Ltd
Tel
18008658728
Email
2718637152@qq.com
Country
China
ProdList
2986
Advantage
58
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel
4006608290; 18621169109
Fax
86-21-61259102
Email
market03@meryer.com
Country
China
ProdList
40241
Advantage
62
Alfa Aesar
Tel
400-6106006
Fax
021-67582001/03/05
Email
saleschina@alfa-asia.com
Country
China
ProdList
30132
Advantage
84
TCI (Shanghai) Development Co., Ltd.
Tel
021-67121386
Fax
021-67121385
Email
Sales-CN@TCIchemicals.com
Country
China
ProdList
24539
Advantage
81
Beijing dtftchem Technology Co., Ltd.
Tel
010-60275820 13031183356
Fax
010-60270825
Email
elainezt@sina.com
Country
China
ProdList
1392
Advantage
62
BeiJing Hwrk Chemicals Limted
Tel
0757-86329057 18501085097
Fax
010-89508210
Email
sales3.gd@hwrkchemical.com
Country
China
ProdList
7508
Advantage
55
Energy Chemical
Tel
021-021-58432009 400-005-6266
Fax
021-58436166
Email
sales8178@energy-chemical.com
Country
China
ProdList
44751
Advantage
61
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View Lastest Price from Tetramethyl orthosilicate manufacturers

Hebei Mojin Biotechnology Co., Ltd
Product
Tetramethyl orthosilicate 681-84-5
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
50000KG/month
Release date
2023-06-28
Hebei Guanlang Biotechnology Co,.LTD
Product
Tetramethyl orthosilicate 681-84-5
Price
US $1.70/Kg/Drum
Min. Order
10g
Purity
99%
Supply Ability
10000kg
Release date
2021-07-07
Hebei Guanlang Biotechnology Co., Ltd.
Product
Tetramethyl orthosilicate 681-84-5
Price
US $100.00/KG
Min. Order
1KG
Purity
99%min
Supply Ability
200TON
Release date
2020-12-10

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